(Tag).Value

Description

A value is the optional value of the tag. The string value can be from 1
to 256 Unicode characters in length and cannot be prefixed with "aws:" or
"rds:". The string can only contain only the set of Unicode letters, digits,
white-space, '_', '.', '/', '=', '+', '-' (Java regex: "^([\\p{L}\\p{Z}\\p{N}_.:/=+\\-]*)$").